Source: https://raw.githubusercontent.com/NixOS/nixpkgs/master/pkgs/development/tools/build-managers/meson/allow-dirs-outside-of-prefix.patch
--- a/mesonbuild/coredata.py
+++ b/mesonbuild/coredata.py
@@ -506,7 +506,6 @@ class CoreData:
             return value
         if option.name.endswith('dir') and value.is_absolute() and \
            option not in BULITIN_DIR_NOPREFIX_OPTIONS:
-            # Value must be a subdir of the prefix
             # commonpath will always return a path in the native format, so we
             # must use pathlib.PurePath to do the same conversion before
             # comparing.
@@ -518,7 +517,7 @@ class CoreData:
             try:
                 value = value.relative_to(prefix)
             except ValueError:
-                raise MesonException(msg.format(option, value, prefix))
+                pass
             if '..' in str(value):
                 raise MesonException(msg.format(option, value, prefix))
         return value.as_posix()
